Small Steps Towards a Grand Unification and the Electron/Positron Excesses in Cosmic-Ray Experiments

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We consider a small extension of the standard model by adding two Majorana fermions; those are adjoint representations of the SU(2){sub L} and SU(3){sub c} gauge groups of the standard model. In this extension, the gauge coupling unification at an energy scale higher than 10{sup 15} GeV is realized when the masses of the triplet and the octet fermions are smaller than 10{sup 4} GeV and 10{sup 12} GeV, respectively. We also show that an appropriate symmetry ensures a long lifetime of the neutral component of the triplet fermion whose thermal relic density naturally explains the observed dark matter density. ... continued below

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11 pages

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Ibe, Masahiro; /SLAC & , June 11, 2010.

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We consider a small extension of the standard model by adding two Majorana fermions; those are adjoint representations of the SU(2){sub L} and SU(3){sub c} gauge groups of the standard model. In this extension, the gauge coupling unification at an energy scale higher than 10{sup 15} GeV is realized when the masses of the triplet and the octet fermions are smaller than 10{sup 4} GeV and 10{sup 12} GeV, respectively. We also show that an appropriate symmetry ensures a long lifetime of the neutral component of the triplet fermion whose thermal relic density naturally explains the observed dark matter density. The electron/positron excesses observed in recent cosmic-ray experiments can be also explained by the decay of the triplet fermion.

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11 pages

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  • Journal Name: JHEP 0908:086,2009; Journal Volume: 09; Journal Issue: 08

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  • Report No.: SLAC-PUB-13689
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 981676
  • Archival Resource Key: ark:/67531/metadc1014921

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  • June 11, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Nov. 3, 2017, 1:49 p.m.

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Ibe, Masahiro; /SLAC & ,. Small Steps Towards a Grand Unification and the Electron/Positron Excesses in Cosmic-Ray Experiments, article, June 11, 2010; [California]. (digital.library.unt.edu/ark:/67531/metadc1014921/: accessed June 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.